Balancing substance delivery in vaporizers

ABSTRACT

This disclosure describes control of a personal vaporizer, such as an electronic cigarette, a vape pen, vape kits, e-cig, or e-hookah, electronic nicotine delivery system, that either can be coupled to one or more other personal vaporizers or that has two or more cartridges for vapor generation and delivery. Personal vaporizers can provide controlled substances (e.g., nicotine, Tetrahydrocannabinol (THC), Cannabidiol (CBD), etc.). In addition to the controlled substances, personal vaporizers allow for unique flavors as compared to traditional inhalation devices (e.g., cigarettes, cigars, or pipes). Since cartridges for personal vaporizers often provide a fixed dosage of substance and limited range of flavors, it can be desirable to allow the user to mix and combine multiple cartridges.

BACKGROUND

Personal vaporizers provide an alternative to smoking techniques, whichinvolve combustion of organic matter and inhalation of the vapor.Instead vaporizers atomize a substance (e.g., a nicotine substance orcannabis substance) using a heating element to simulate the combustionfound in traditional cigarettes. Personal vaporizers often useremovable/replaceable cartridges containing a substance for atomization.The cartridges often have fixed concentrations of substances, and setflavors.

SUMMARY

The present disclosure involves systems, methods, and an apparatus forcontrolling a personal vaporizing system with multiple atomizationchambers. The system includes a body that has a power supply, a firstatomization chamber and first chimney configured to deliver atomizedsubstance to a user, a second atomization chamber and second chimneyconfigured to deliver atomized substance to a user, a first sensor thatprovides a signal associated with airflow through the first atomizationchamber, and a controller that includes a communications module andapplies current to an actuator in response to the signal from the firstsensor and a second signal from a second sensor associated with thesecond atomization chamber.

Implementations can optionally include one or more of the followingfeatures.

In some instances, the personal vaporizer includes a cartridge thatprovides a flow path to transport vaporized substance to the user, thecartridge including the first atomization chamber and the actuator.

In some instances, the first sensor and the second sensor are puffsensors.

In some instances, the actuator is a heating element.

In some instances, the applied current is determined based on a lowestinput received from the first sensor and the second sensor.

In some instances the communications module uses an I2C protocol tocommunicate with the at least one second sensor.

The details of these and other aspects and embodiments of the presentdisclosure are set forth in the accompanying drawings and thedescription below. Other features, objects, and advantages of thedisclosure will be apparent from the description and drawings, and fromthe claims.

DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic side cross-sectional view of a coupling vaporizerwith a removable cartridge and some internals shown.

FIG. 2 is a block diagram schematic of a control circuit for couplingvaporizers.

FIG. 3 is a flow chart showing an example process for determiningapplied power by a controller.

FIGS. 4A-4C illustrate an example connector for communications betweencouplable vaporizers.

DETAILED DESCRIPTION

This disclosure describes control of a personal vaporizer, such as anelectronic cigarette, a vape pen, vape kits, e-cig, or e-hookah,electronic nicotine delivery system, that either can be coupled to oneor more other personal vaporizers or that has two or more cartridges forvapor generation and delivery. Personal vaporizers can providecontrolled substances (e.g., nicotine, Tetrahydrocannabinol (THC),Cannabidiol (CBD), etc.). In addition to the controlled substances,personal vaporizers allow for unique flavors as compared to traditionalinhalation devices (e.g., cigarettes, cigars, or pipes). Sincecartridges for personal vaporizers often provide a fixed dosage ofsubstance and limited range of flavors, it can be desirable to allow theuser to mix and combine multiple cartridges.

Couplable personal vaporizers or vaporizers that utilize multiplecartridges can enable this combination of different cartridges. Byproviding a personal vaporizer system which can couple with additionalpersonal vaporizer systems, a user can mix and combine different flavorsor dosages by using two or more coupled vaporizers simultaneously. Inorder to ensure consistent results, the coupled vaporizers cancommunicate, and compare sensed signals (e.g., “puff” signals) toprovide balanced or consistent mixtures of vapors.

Turning to the illustrated example, FIG. 1 illustrates a detailedschematic view of a personal vaporizer 100A which can be attached to apersonal vaporizer 100B, with some internals shown. At least one, and incertain instances, both personal vaporizers 100A and 100B are eachseparately operable. Personal vaporizer 100A includes a body 202,cartridge 204, and mouthpiece 206. In some instances, each personalvaporizer can be identical; in some instances, they can be different.For example, one personal vaporizer 100 can be larger, and configured toattach to multiple other vaporizers, which can be smaller, and includefewer features (e.g., lights, smaller battery etc.). In someimplementations, each personal vaporizer 100 can include a similar flowpath, which results in a similar draw when a user applies suction. Inthe illustrated implementation, the cartridge 204 is removable from thebody 202 via a coupler 222. The coupler 222 can have two parts, one thatis part of the cartridge portion 204 or mouthpiece portion 206 and onethat is part of the body portion 202, e.g., one part being female andconfigured to receive the other, male, part. The mechanical coupler canbe, for example, threads, a lug/channel connector, a recessed magneticconnector, or other suitable manner for coupling the two portions of thepersonal vaporizer 100A. In addition, an electrical connection can alsobe facilitated in the connection between the mechanical coupler 222parts. Similarly, in some instances, the mouthpiece 206 is removablefrom the cartridge 204 via a coupler 222.

Body 202, includes side couplers 208A-208C. The side couplers can bemagnetic or have an interlocking mechanism, which allows the personalvaporizer 100A to be coupled with another personal vaporizer (e.g.personal vaporizer 100B). The side couplers 208A-C provide forconnecting and disconnecting the two personal vaporizers 100A and 100B.In some implementations, the side couplers 208A-C include magnets thatare aligned to attract and hold the personal vaporizers together. Themagnets can be recessed into the body, which can further include matingmale and female profiles (e.g., guide slots and ribs), or another mannerfor establishing and maintaining proper alignment when the vaporizersare attached. In some implementations, the side couplers 208 includelatches, or a tongue and groove system, which allows for interlocking ofthe personal vaporizers. The body 202 can further include features thatassist with alignment and traction between vaporizers. For example, body202 can include a number of ridges and grooves, which are configured toslot into similar ridges and grooves on the body of another personalvaporizer. While three side couplers 208A-C are illustrated, more, orfewer side couplers are contemplated within the scope of thisdisclosure. Additionally, body 202 can include side couplers on bothsides, or one side and the front, in order to facilitate coupling withmultiple additional vaporizers (e.g., three or four coupled vaporizers).

The body 202 further includes a power source 210, which can provideelectrical power to control circuits 212, and a heating element in theatomization chamber 214. Power source 210 can include a battery, such asa lithium ion (Li-ion), nickel metal hydride (NiMH), Alkaline or otherbattery. In some implementations, the battery is user replaceable. Insome implementations, the battery is integrated with the body 202. Powersource 210 can also include charging circuitry required for rechargingthe battery.

Control circuitry 212 can include necessary circuitry to operate thepersonal vaporizer 100A. Control circuitry 212 can include one or moremicrocontrollers, or analog circuits, as well as sensors for operation.A puff sensor can be provided in the control circuitry 212, whichdetects whether or not a user is drawing on the mouthpiece. The puffsensor can be a microphone, or a diaphragm based pressure sensor, orother pressure sensor. In some implementations, the control circuitry212 can detect whether or not a cartridge is installed, or whether ornot the personal vaporizer 100A is coupled to another vaporizer. In someinstances, the control circuitry 212 can communicate with the controlcircuitry of another vaporizer coupled to the personal vaporizer 100A,for example, to average the outputs of both puff sensors and provideequal atomization across both vaporizers. The control circuitry 212 isdiscussed in further detail below with reference to FIG. 2.

Cartridge 204 includes an atomization chamber 214, through which airflows past a heating element and a wick that is exposed to a substanceto be atomized. The atomized vapor can leave the vaporization chamberwith the flowing air up through a passage or chimney 216. Cartridge 204further includes a reservoir that contains the substance to be atomized.In some implementations, a puff sensor is located in the cartridge 204,and communicates with control circuitry 212 when the cartridge 204 iscoupled with the body 202. One or more air inlet vents 224 are providedon the cartridge 204 for allowing airflow into the cartridge 204 whenthe user draws air through the personal vaporizer 100A. In someimplementations, the liquid reservoir includes a clear or translucentwindow 220 to the exterior of the cartridge 204 for visually determiningthe liquid level within the liquid reservoir.

Mouthpiece 206 includes a channel 218, which extends the chimney 216 andprovides a flow path through the atomization chamber 214 into the user'smouth when the mouthpiece is coupled to the cartridge 204. In certaininstances, the cartridge is integral with the body 202, and themouthpiece 206 couples directly to the body 202. The mouthpiece 206 canhave a rubberized or textured outer surface to increase comfort and aidin the user achieving a seal between the mouthpiece 206 and their lips.Additionally, at least one surface of the mouthpiece (e.g., the side)can be shaped to abut or nest with another mouthpiece of a differentpersonal vaporizer. Together the combined mouthpieces can form a single,larger mouthpiece, with two channels to provide a mix of substances fromtwo vaporizers. Other examples of couplable vaporizers that can be usedwith the concepts herein are disclosed in U.S. patent application Ser.No. 17/243,048, entitled Attachable Vaporizers. The contents of thisapplication are incorporated by reference herein.

Although this disclosure has been described in terms of certainembodiments and generally associated methods, alterations andpermutations of these embodiments and methods will be apparent to thoseskilled in the art. Accordingly, the above description of exampleembodiments does not define or constrain this disclosure. Other changes,substitutions, and alterations are also possible without departing fromthe spirit and scope of this disclosure.

FIG. 3 is a block diagram schematic of a control circuit 400 forattachable vaporizers or vaporizers with multiple cartridges. Controlcircuit 400 can be embedded with, or separate from control circuit 212as illustrated with respect to FIG. 2. In some implementations, controlcircuit 400 is the same as control circuit 212. Control circuit 400 caninclude a controller 402, one or more sensors 416, and an actuator 418(e.g., an atomizer, heating element, etc.).

A battery 412 provides electrical power to the controller 402, as wellas other components in the system (e.g., actuator 418, and sensors 416).The battery can be a lithium ion (Li-ion), nickel metal hydride (NiMH),Alkaline, or other battery. In some implementations, the battery is userreplaceable. In some implementations, the battery is integrated with thebody 202. Charging circuitry that is required for recharging the batterycan also be included (not shown) and can be part of the controller 402,or a separate component.

Actuator 418 is the component being controlled by the controller 402.Actuator 418 can be a heating element, which surrounds a wick in anatomization chamber of a cartridge, and is designed to vaporize oratomize liquid that is transported by the wick. The actuator 418 canconvert current supplied by the controller 402 into heat, or vibrations,or other forms of energy in order to atomize substance. In someimplementations, the actuator 418 atomizes liquid at a rate that isproportional to the electrical current supplied by the controller 402.

One or more sensors 416 can generate inputs to the controller 402.Sensors 416 can be active sensors (e.g., require a power supplied frombattery 412 or controller 402) or passive sensors (e.g., provide anoutput signal without requiring supplied power). In someimplementations, sensors 416 include a pressure sensor, which measurespressure inside or near an atomization chamber. In some implementations,multiple pressure sensors are used. For example, a first pressure sensorcan be located inside the atomization chamber, or along the flow paththrough the atomization chamber, and a second pressure sensor can belocated outside of the device and configured to sense ambient pressure.In this instance, a flow rate through the personal vaporizer can bedetermined, for example, by calculating a differential pressure betweenthe two pressure sensors. In some implementations, a single pressuresensor is used, and flowrate can be assumed to have an inverserelationship (e.g., proportional and/or other relationship) to thesensed pressure of the single pressure sensor. For example, when a usersucks on a mouthpiece of the vaporizer, pressure will drop in theatomization chamber as flowrate increases. In some instances, amicrophone is used which can sense acoustic energy associated with flowthrough the vaporizer. In some instances, a combination of pressuresensors and microphones, as well as other sensors (e.g., temperaturesensors, accelerometers/G-force sensors, etc.) are used to detectwhether or not the user is “puffing” on the personal vaporizer. Thesensor(s) 416 herein can be referred to a puff sensor 416, which detectswhen and with how much force the user is puffing on the vaporizer.

Controller 402 reads inputs from the sensors 416, and drives an outputto the actuator 418 based on inputs, including those from sensors 416.In addition to receiving inputs from the sensors 416, the controller 402can receive inputs, and based on the inputs, output instructions to oneor more additional personal devices 414. In certain instances,additional devices 414 include additional personal vaporizers that arecoupled to the personal vaporizer. In certain instances, additionaldevices 414 also or alternatively include other devices, such as auser's cell phone, a docking station, or other device that communicateswith the control circuit 400. Controller 402 includes a conditioningcircuit 404, which can include circuitry and logic for conditioningsignals from the sensors 416. For example, the conditioning circuit 404can include filtering circuits such as low-pass, high-pass, or band-passfilters. In some implementations, where one or more of the sensors 416is an active sensor, the conditioning circuit 404 provides power, orcarrier signals to operate the active sensors. In general, conditioningcircuit 404 includes circuitry and logic to provide sensed signals fromthe sensors 416 to the control logic 408. The conditioning circuit 404can include analog circuitry, or digital circuitry (e.g., one or moremicrocontrollers).

The driver circuit 410 is configured to receive a control signal fromthe control logic 408, and convert it to a signal that is suitable tooperate the actuator 418. For example, in certain instances controllogic 408 provides a low current 0-3.3V digital signal (e.g., a PWMgating signal). Driver circuit 410 can include one or more transistors,which operate to provide electrical power directly from the battery 412to the actuator 418 at a rate proportional to the digital controlsignal. In general, the driver circuit 410 permits the relatively lowpower control logic 408 to power the higher power actuator 418.

A communication circuit 406 provides for communications between thecontrol circuitry 400 and one or more additional devices 414. Thecommunications circuit 406 includes logic encoded in software and/orhardware in a suitable combination and operable to communicate with theadditional devices 414 and other components such as the control logic408, or sensors 416. More specifically, the communication circuit 406operates software supporting one or more communication protocolsassociated with communications that enables the control circuitry 400 tocommunicate physical signals within and outside personal vaporizer. Insome implementations, the communication circuit 406 uses aninter-integrated circuit (I2C) protocol to establish communicationsbetween the personal vaporizer and additional devices 414. The I2Cprotocol can be implemented using pin connecters. In someimplementations the communication circuit 406 uses a wireless protocol(e.g., Bluetooth Low Energy, Wi-Fi, ZigBee, etc.) to communicate withadditional devices 414.

Control logic 408 describes what is to be accomplished by the controlcircuitry 400 in response to inputs from the sensors 416, and theadditional devices 414. In general, the control logic 408 can operate intwo modes, standalone mode, or multi-device mode. In general, thecontrol logic 408 attempts to maintain a constant flavor or substancedelivery to the user. The amount of substance being delivered to theuser, or the “cloud density” can be described as the ratio between themass flow rate of the substance being atomized, and the flow rate of airthrough the atomization chamber. For example, the cloud density may bedescribed by the equation

$\rho = \frac{\overset{.}{m}}{Q}$

where ρ is the cloud density, {dot over (m)} is the mass flow rate ofsubstance being atomized and Q is the flow rate of air through theatomization chamber. Q is proportional to the users puff strength, whichcan be detected based on the puff sensor, or sensors 416. It should benoted that Q will change based on puff strength, but also the geometryof the cartridge/vaporizer, atmospheric conditions (e.g., temperature)and other factors. In some implementations, Q can be assumed directlyproportional to the output of the puff sensor. Mass flow rate, {dot over(m)}, can similarly be assumed to be proportional to the current orpower applied to the heating element or actuator 418. If the powerapplied is D then the control logic can calculate D required for adesired cloud density using the equation D=ρQ. Cloud density ρ can beuser selected (e.g., via a slider or knob, or using a mobile device incommunications with communication circuit 406), or predetermined (e.g.,by the manufacturer). In standalone mode, the control logic 408 can pollor read sensors 416 to determine Q, and then determine a D to apply tothe actuator 418. When the vaporizer is coupled to another vaporizer oradditional device 414, the communication circuit 406 can detect anadditional device is present and provide that as an indication tocontrol logic 408, which can switch to multi-device mode.

Multi-device mode operates similarly to standalone mode however, Q isdetermined differently. Because the user may not draw equal flow througheach coupled vaporizer, the multi-device mode provides a technique forensuring that both vaporizers provide similar cloud densities, and thusa consistent flavor or dosage. In multi-device mode, the control logiccan communicate with the conditioning circuit 404 and therefore sensors416 of multiple vaporizers, as well as broadcast and coordinate theapplied power D to each actuator 418 in the group of coupled vaporizers.In one implementation, during multi-device mode, it can be assumed thatthe puff strength, or Q for each vaporizer will be similar, although notequal. In order to prevent overproduction of vapor in the vaporizer withthe lowest Q, the control logic 408 for each device can provide a Dbased on the lowest Q for in the group. In another implementation, Q'sfrom each vaporizer are averaged, to determine an average flow rate,which is then used to calculate D for each device. In certain instances,a weighted average is used (e.g., the lowest Q receives a higher weightthan the highest Q). During multi-device mode, the control circuitry 400can establish a master/slave relationship with other additional devices414 that are connected. In this manner, a single device can read thesensors associated with each coupled vaporizer, determine, and broadcasta D to be supplied to each heating element of each personal vaporizer.

FIG. 3 is a flow chart showing an example process for determiningapplied power D by a controller. Process 500 can be executed by controlcircuitry 400, or a portion thereof.

At 502, it is determined whether the device is in standalone mode ormulti-device mode. In some implementations, this is determined based ona connection. For example, where the devices use an I2C protocol, amonitor pin can be connected to a ground pin of another device, drivinga value on the monitor pin to a digital low, and indicating that thedevice should operate in multi-device mode. If the monitor pin is at adigital high (e.g., 3V or 5V, etc.) then standalone mode is indicated.

At 504, a puff strength is determined in order to determine a Q or airflow rate for the vaporizer. In some implementations, a puff sensor(e.g., a pressure sensor, microphone, diaphragm, or other device) whichprovides a voltage or other signal that corresponds to the airflow inthe personal vaporizer.

At 506, the desired cloud density ρ is determined. Cloud density ρ canbe user selected (e.g., via a slider or knob, or using a mobile devicein communications with the personal vaporizer), or predetermined (e.g.,by the manufacturer).

At 508, a power to apply D is determined in order to achieve the desiredcloud density ρ. In some implementations, D is simply the product of Qand ρ.

At 510, the calculated D is applied to an actuator (e.g., heatingelement) in order to produce vapor and create the desired cloud duringinhalation. Process 500 can return to 502 where an assessment is done todetermine whether the device should remain in standalone mode or switchto multi-device mode.

If the device is in multi-device mode, at 512, the puff strength for thelocal device is determined. For example, each device in multi-devicemode can include an independent puff sensor. The local puff sensor canbe used to determine puff strength for the local device.

At 514, puff strength for other devices (e.g., attached or coupleddevices) with their own puff sensors is received (e.g., via acommunications module). This can include puff strengths from attacheddevices, or secondary devices (e.g., second cartridges) within theprimary device.

At 516, Q is determined. Because the user may not draw equal flowthrough each coupled vaporizer, the multi-device mode provides atechnique for ensuring that all vaporizers provide similar clouddensities, and thus a consistent flavor or dosage. The control logiccommunicates sensors. In one implementation, in order to preventoverproduction of vapor in the vaporizer with the lowest airflow, Q isdetermined based on the device with the lowest puff strength. In someimplementations, puff strengths from each device are averaged, todetermine an average flow rate, which is then used to calculate D foreach device. In certain instances, a weighted average is used (e.g., thelowest Q receives a higher weight than the highest Q).

518-522 proceed similarly to 506-508, and a D is determined based on thedetermined Q, then applied to the local actuator. At 524, the determinedD can be broadcast, or otherwise transmitted to other devices, which canuse the determined D to provide uniform cloud densities from multipledevices.

FIGS. 4A-4C illustrate an example connector for communications betweenattachable vaporizers. FIG. 4A shows a personal vaporizer 600A with aconnector 602 on the side. In some implementations the connector 602 canbe integral to a side coupler (e.g., side coupler 110 as described withrespect to FIG. 1A) and can include a magnet or guide slots to assist incoupling of personal vaporizer 600A with another personal vaporizer. Theconnector 602 additionally includes one or more pins that can contact,and make electrical connection with the pins of a connector on adifferent device. FIG. 4B illustrates an example pin layout for an I2Cprotocol which allows communication between two or more personalvaporizers in a master/slave format. FIG. 4C illustrates the electricalconnections when two personal vaporizers 600A and 600B are connected.

Connecter 602 includes a ground pin (GND) 604, a monitor pin (D1) 606, aclock pin (SCL) 608 and a data pin (SDA) 610. The monitor pin 606 canindicate whether the device is connected to another personal vaporizer,as when connected, the D1 pins 606 of each vaporizer will be connectedto the ground pins 604 of the attached vaporizer, driving a voltage oneach respective D1 pin to ground, or a digital low value. When thecontrol circuitry (e.g., control circuitry 402 as described with respectto FIG. 2) detects a digital low on its D1 pin 606, it can determinethat it has been connected to another personal vaporizer, and establisha master/slave relationship.

In some implementations, the master/slave relationship is established byhaving each personal vaporizer (e.g., personal vaporizers 600A and 600B)wait a random or pseudo-random amount of time before checking for aclock signal on the clock pin 608. If, for example, a wait timer ofpersonal vaporizer 600A expires before the wait timer of personalvaporizer 600B, then no clock signal will be detected by personalvaporizer 600A. Personal vaporizer 600A can begin transmitting a clocksignal and become the master. Personal vaporizer 600B's clock signalwill expire later (in this example) and therefore personal vaporizer600B will detect a clock signal, and assume a slave role. Once themaster/slave roles are established communication can begin on the datapin 610, including address assignment, polling for sensor data (e.g.,personal vaporizer 600A requests puff sensor data from personalvaporizer 600B), and broadcasting command signals (e.g., personalvaporizer 600A transmits a control signal to supply current to theheating element of personal vaporizer 600B).

This protocol allows for rapid connection and communication betweendevices that do not have pre-assigned addresses, and can be connected ordisconnected without establishing communication parameters.

1. A personal vaporizer comprising: a body comprising: a power supply; afirst atomization chamber and first chimney configured to deliveratomized substance to a user; a second atomization chamber and secondchimney configured to deliver atomized substance to a user; a firstsensor, configured to provide a signal associated with airflow throughthe first atomization chamber; and a controller comprising acommunications module, the controller configured to apply current to anactuator in response to the signal from the first sensor and a secondsignal from a second sensor associated with the second atomizationchamber.
 2. The personal vaporizer of claim 1, comprising: a cartridgeproviding a flow path to transport a vaporized substance to a user, thecartridge comprising the first atomization chamber and the actuator. 3.The personal vaporizer of claim 1, wherein the first sensor and thesecond sensor are puff sensors.
 4. The personal vaporizer of claim 1,wherein the actuator is a heating element.
 5. The personal vaporizer ofclaim 1, wherein the applied current is determined based on a lowestinput received from the first sensor and the second sensor.
 6. Thepersonal vaporizer of claim 1, wherein the applied current is determinedbased on an average of the signals received from the first sensor andthe second sensor.
 7. The personal vaporizer of claim 1, wherein thecommunications module use an I2C protocol to communicate with the secondsensor.
 8. A method for generating atomized substance in a personalvaporizer comprising: receiving, from a first sensor associated with afirst atomization chamber and a first chimney configured to deliveratomized substance to a user, a first signal from a first sensor, thefirst signal associated with airflow through the first atomizationchamber; receiving, from a second sensor associated with a secondatomization chamber and a second chimney configured to deliver atomizedsubstance to a user, a second signal from a second sensor, the secondsignal associated with airflow through the second atomization chamber;and applying, by a controller comprising a communications module, acurrent to an actuator associated with the first atomization chamberbased on the first and second signals.
 9. The method of claim 8, whereinthe first atomization chamber and the actuator are included in acartridge that provides a flow path to transport a vaporized substanceto a user.
 10. The method of claim 8, wherein the first sensor and thesecond sensor are puff sensors.
 11. The method of claim 8, wherein theactuator is a heating element.
 12. The method of claim 8, wherein theapplied current is determined based on a lowest input received from thefirst sensor and the second sensor.
 13. The method of claim 8, whereinthe applied current is determined based on an average of the signalsreceived from the first sensor and the second sensor.
 14. The method ofclaim 8, wherein the communications module use an I2C protocol tocommunicate with the second sensor.
 15. A system for generating atomizedsubstance in a personal vaporizer configured perform operationscomprising: receive, from a first sensor associated with a firstatomization chamber and a first chimney configured to deliver atomizedsubstance to a user, a first signal from a first sensor, the firstsignal associated with airflow through the first atomization chamber;receive, from a second sensor associated with a second atomizationchamber and a second chimney configured to deliver atomized substance toa user, a second signal from a second sensor, the second signalassociated with airflow through the second atomization chamber; andapply, by a controller comprising a communications module, a current toan actuator associated with the first atomization chamber based on thefirst and second signals.
 16. The system of claim 15, wherein the firstatomization chamber and the actuator are included in a cartridge thatprovides a flow path to transport a vaporized substance to a user. 17.The system of claim 15, wherein the first sensor and the second sensorare puff sensors.
 18. The system of claim 15, wherein the actuator is aheating element.
 19. The system of claim 15, wherein the applied currentis determined based on a lowest input received from the first sensor andthe second sensor.
 20. The system of claim 15, wherein the appliedcurrent is determined based on an average of the signals received fromthe first sensor and the second sensor.